A018106 - OEIS

%I #6 Dec 19 2022 15:56:50

%S 1,2,5,10,21,45,96,206,441,944,2021,4326,9261,19825,42439,90849,

%T 194481,416325,891224,1907839,4084101,8742815,18715702,40064612,

%U 85766121,183599119,393029742,841356859,1801088541

%N Powers of fourth root of 21 rounded to nearest integer.

%t Round[Surd[21,4]^Range[0,30]] (* _Harvey P. Dale_, Dec 19 2022 *)

%K nonn

%O 0,2

%A _N. J. A. Sloane_.